Nitro Coffee: A New Trend in Cold Brew

In cold brew coffee, grinds are infused into cold water to make a strong brew that reduces acidity and bitterness. Some coffee roasters have started using nitrogen gas to amp up their cold brew coffee's silky texture and add a creaminess to the basic black brew. The resulting nitro coffee has creamy, sweet, and smooth flavors without added milk or sugar -- although these can be added to taste. While nitrogen coffee offers a cool factor that's rapidly gaining converts, it isn't without risk. 

How Nitro Brew is Made

It all starts with the cold brew, where coffee grinds soak in distilled water to create a rich coffee concentrate. The mixture is then diluted with water. Coffee lovers claim cold brew coffee tastes better than hot coffee, because it captures the flavors of the brew without the acidic notes. The underlying fruity, floral, or spices notes within the coffee are allowed to shine for a deeper coffee drinking experience. 

In a nitro coffee process, nitrogen gas is added to the cold brew coffee. This can happen during canning or bottling, which creates a shelf stable product, or coffee shops can use a tap system to infuse cold brew with nitrogen. In either case, when nitrogen meets the water content in coffee, it doesn't dissolve readily, as another gas might. This gives the nitro coffee a rich mouthfeel and a creamy head, mimicking the creamy flavor of coffee with cream without the dairy. Tiny bubbles of nitrogen gas make the drink thicker for a better mouthfeel. It's almost like a dessert version of iced coffee, especially when the nitro coffee is served with sugar syrup and cream -- or as the base for an ice cream soda. 

While nitrogen gas enhances the flavor of coffee, there are risks associated with using this gas to infuse coffee. Nitrogen gas displaces oxygen from the environment -- part of the reason it makes that coffee taste so good -- and this can cause health hazards if the gas leaks into the air. 

Coffee shops that serve nitrogen coffee on tap or bottle the beverage for consumption must worry about the potential for a nitrogen gas leak. If a nitrogen dewar or supply line were to develop a leak, the leaking gas would reduce oxygen levels in the room. Since nitrogen has no color or odor, there is no way for employees or customers to know there is a leak. 

If the oxygen levels fall so low that the air is unsafe to breathe, employees and customers can experience respiratory distress, cognitive confusion or -- in a worst case scenario -- death via asphyxiation. One simple safety device can monitor oxygen levels to ensure there's enough breathable air in the room and provide sufficient warning of a nitrogen leak. 

How an Oxygen Monitor Protects Public Health 

By installing an oxygen monitor anywhere that nitrogen gas is stored or used, coffee shops can protect against the risks of a nitrogen leak. Oxygen monitors continually sample the air to determine oxygen levels. As long as the air has enough oxygen, the monitor remains silent. If levels of oxygen in the air fall to OSHA's critical threshold, which would suggest that nitrogen gas is displacing oxygen, the monitor will flash lights and sound a 90-decibel alarm to warn people of the imminent health threat. Staff and customers can then leave the cafe until emergency personnel arrive to contain the nitrogen leak.

PureAire's alarm has a digital display, which shows a constant readout of oxygen levels in the room. This can provide peace of mind that everything's working properly. Since these oxygen monitors resist drift from thunderstorms, barometric shifts or other incidents, they are reliable all year round. 

PureAire's line of oxygen monitors feature robust zirconium sensors, which last for 10+ years. PureAire products require no maintenance or calibration once set up, and offer a low-maintenance and long-lasting alternative to other oxygen monitors. To learn more about PureAire's products, please visit www.pureairemonitoring.com. 

The Overview on Inert Glove Boxes and How They Work

For businesses that work with inert gases or hazardous materials, glove boxes are essential. They allow employees to safely work with sensitive or hazardous materials without compromising either the material or their safety. While glove boxes are an effective solution to handling inert and hazardous materials, they are not failsafe. To ensure there are no leaks in the glove box, it's critical to pair a glove box with an oxygen monitor. 

How a Glove Box Works 

A glove box, sometimes known as a dry box, is a large box with at least one window and two ports. The ports allow workers wearing arm-length gloves to place their hands inside the inert environment, where they can work with hazardous materials or inert gases, such as argon or nitrogen. 

The interior of the glove box is filled with an inert gas -- usually nitrogen, although it could be argon or helium if the materials used inside the box react with nitrogen. While the glove box environment is intended to be closed, small amounts of oxygen can seep through the glove ports. Thus, it's essential that the glove box be purged nightly. 

There's an antechamber on one side of the glove box. This allows you to place materials in the chamber, then open the interior door and bring them into the glove box environment. To prevent the insert gas inside from seeping out through the antechamber, you must never have both the interior and exterior door open at the same time. 

Inert gases, such as nitrogen and argon, displace oxygen. If these gases were to leak into the air via the antechamber doors or through a hole in a defective glove box, it would push oxygen out of the room. Oxygen levels would begin to drop, eventually falling below the OSHA threshold. 

When oxygen levels drop below the OSHA threshold, it can cause respiratory and cognitive problems, as well as death via asphyxiation. To protect employee safety in a glove box environment, it's critical to use oxygen monitors onsite. 

How an Oxygen Monitor Protects Your Workers 

While your staff might see the antechamber doors open and understand that a leak has occurred, most leaks are undetectable until it is too late. 

Inert gases have no color or odor, so there is no way for someone working onsite to know at a glance or sniff there's been a leak. Meanwhile, the air in the room would slowly lose oxygen, eventually leading to an oxygen deficient environment that places your employees at risk of death by asphyxiation. 

A wall-mounted oxygen monitor samples room air 24/7. The monitor remains silent if there's sufficient air in the room. If there is a leak of nitrogen, for example, and oxygen levels fall, the monitor will sound an alarm and flash lights, so workers can see and hear there is a problem. 

Your employees will be able to leave the room before suffering adverse health effects. Staff will also be able to complete shifts with less stress when they know the environment is safe, because they trust the oxygen monitor is working properly. 

PureAire's oxygen monitors feature long-lasting zirconium sensors. Once installed, these oxygen monitors measure the oxygen in the air for 10 or more years, without needing annual calibration or maintenance. The monitors are unaffected by sudden shifts in barometric pressure or thunderstorms. The digital display provides legible, updated oxygen readings so employees can check ambient oxygen levels. PureAire's oxygen monitors can be used in confined spaces and in temperature extremes as low as -40 Celsius. All PureAire oxygen monitors come with a three year warranty for your protection. Review specifications or learn more about oxygen monitors from PureAire by visiting www.pureairemonitoring.com

The Benefits of Nitrogen and Carbon Dioxide for Food Processing

A blend of gases -- carbon dioxide, oxygen, and nitrogen -- help preserve packaged food by reducing the amount of oxygen inside the sealed package. Gas flushing or Modified Atmosphere Packaging, as the process is called, also reduces the amount of processing that food must undergo. This preserves the quality and nutrient content of meats, vegetables, and other foods.

Estimates suggest that 25-40 percent of fresh food does not reach consumers due to spoilage in transit. Modified Atmosphere Packaging enables fresh food to stay fresh by slowing down the food spoilage process, reduces food waste, and allows consumers to store purchased foods for longer. 

Without Modified Atmosphere Packaging, oxygen levels inside food packages would be 20.9 percent. By introducing nitrogen into the package, facilities strive to lower oxygen levels, sometimes as far as zero. With no oxygen inside the package, bacteria will be unable to grow and the food will not oxidize. Carbon dioxide also inhibits bacteria growth and lowers the pH of preserved food. Carbon monoxide is often used in meat packaging, as it can preserve the red color. Packing plants use either low-barrier, breathable film that allows fruits and vegetables to breathe, or high-barrier film that prevents gas inside packaged meat, fish, or cheese from seeping out. 

As oxygen is flushed out of the package, the blend of nitrogen and carbon dioxide or carbon monoxide is piped in and the package is sealed, trapping the inert gases inside.

While the process of Modified Atmosphere Packaging revolutionized food packing, it isn't without risk. Nitrogen gas, a critical component of the gas flushing blend, has the potential to create an oxygen deficient environment if a leak occurs. As nitrogen leaks, it physically displaces oxygen, often in a matter of minutes. As employees breathe air that does not have enough oxygen, they may become tired and confused or experience difficulty breathing. Within minutes, employees could die from asphyxiation as a result of breathing oxygen-deficient air. 

Since nitrogen gas has no color or odor, secondary measures must be used to detect a leak before staff experience life-threatening symptoms. One simple and cost-effective way to monitor the food packing facility for leaks is by using an oxygen monitor. 

How an Oxygen Monitor Protects Workers in Food Packing Plants

While it's critical to maintain the right blend of gas in packaged foods, it's also important to ensure that gas used in food packing equipment does not leak out of the machines. Gases used in food packing, including nitrogen, are colorless and odorless, so staff would be unable to detect a leak visually. By installing an oxygen monitor in the food packing facility, employers can detect leaks before workers' health is adversely affected. 

Since nitrogen gas depletes oxygen, it's easy to tell whether nitrogen is leaking by taking continual measures of oxygen. The secure, wall-mounted oxygen monitor checks the levels of oxygen in the room and remains silent as long as oxygen is above the minimum amount. 

The oxygen monitor will sound an alarm if oxygen falls to 19.5% or 18.0%. The 90 db alarm is designed to be heard over the sound of the equipment, and there's also a flashing light to warn employees of a drop in oxygen levels. Employees can then leave the room before the oxygen falls below the acceptable threshold and staff begin to experience health problems. 

In addition to using oxygen monitors on the food packing line, facilities should also use oxygen monitors wherever inert gases are stored. Oxygen deficiency monitors from PureAire are designed to last for a minimum of 10 years with no maintenance or annual calibration. The monitors feature a digital display that's easy to read, and do not drift as a result of barometric pressure. If you're looking for an oxygen monitor that's low maintenance, accurate, and easy to use, consider PureAire. Visit www.pureairemonitoring.com to learn more.

Nitro Beer Tastes Better

If you've ever remarked on the smooth creaminess of a pint of Guinness, you've picked up on the key difference in its carbonation: Nitrogen rather than carbon dioxide. Such "nitro" beers have become a trend in recent years, with major U.S. breweries and small startups alike offering nitro products. Nitrogen keeps bitterness in check and balances out the hops to make drinkable craft brews, but it also increases the risk for breweries. 

How Nitro Beer Works 

CO₂ is a natural byproduct of the beer brewing process, occurring when the yeast consumes the natural sugars in the wort. Breweries often add additional CO₂ when kegging or bottling the beer. The carbon dioxide gas adds flavor, aroma, and those bubbles that fizz against your tongue. CO₂ is also slightly acidic, so it can intensify the bitter flavors in a brew. While this might be desirable in a hop-bomb IPA or citrusy hefeweizen, it isn't always complementary to the flavor of the brew. 

Nitrogen gas adds carbonation without the bitterness, allowing the beer's natural flavors to remain. It delivers a new drinking experience with favorite brews. Nitrogen is harder to dissolve than carbon dioxide, so the resulting bubbles of carbonation are smaller. The mouth feel of a nitro beer is smoother or creamier. Dark beers -- stouts and porters -- pair well with nitrogen gas, but the nitro technique can also present a new take on a classic IPA or wheat ale. 

While the process of adding nitrogen to beer is similar to carbon dioxide, breweries must take some extra precautions. Nitro beers must be stored in tanks rated to a higher psi, 25 rather than 15. Breweries must also take precautions to ensure that nitrogen isn't leaking out of the supply lines or canisters and onto the brewery floor. Nitrogen gas displaces oxygen from the air, so if it did leak, the room would soon become oxygen deficient. Breathing oxygen deficient air causes confusion, dizziness, respiratory distress, and death via asphyxiation. Since nitrogen gas has no color or odor, breweries need a tool to check for leaks by measuring ambient oxygen levels. 

How an Oxygen Monitor Protects Brewery Staff 

Since staff cannot tell if there is a leak -- there's nothing to see or smell -- there is no way they can protect their health if a leak occurs. Oxygen monitors provide a safeguard against respiratory distress by measuring oxygen levels. As long as there is no leak, the oxygen in the brewery should remain constant. If nitrogen gas starts to leak, oxygen levels will fall. Before oxygen levels fall to a critical threshold, an oxygen monitor will sound an alarm. There's also a flashing light to get the attention of staff. 

When the alarm goes off, workers can exit the brewery floor before the lack of oxygen poses a threat to their health. Emergency personnel can then come and contain the leak. 

PureAire offers a robust oxygen monitor with two alarm levels: 19.5 percent and 18 percent, a 90 db alarm, and a bright flashing light. The oxygen deficiency monitor is designed to mount on the wall and features an easy-to-read digital interface, so workers can tell at a glance whether there's a problem.

PureAire's monitors use zirconium sensors, which deliver reliable performance even during thunderstorms, sudden barometric shifts, and other weather incidents. These O₂ monitors are designed to last for 10 or more years with no maintenance or calibration, unlike other products that need regular maintenance to remain effective.  

Breweries should place one oxygen monitor in the area where beer is bottled and kegged and another where nitrogen is stored. This ensures the entire facility is protected from leaks. 

Left Hand Brewery, a pioneer of the nitro beer trend, relies on PureAire products for workplace safety.  Learn more about the oxygen monitor form PureAire at www.pureairemonitoring.com.

What is a -150C Nitrogen freezer and who uses them?

A -150 C freezer, also known as a nitrogen freezer, is used in cryo preservation. While you might think of Ted Williams being frozen on ice for a future in which he can be brought back to life, the cryo preservation method can be used to keep any type of cell alive in a suspended state. Learn how nitrogen freezers are used and how PureAire can keep your facility safe. 

Who Uses Nitrogen Freezers? 

Nitrogen freezers use liquid nitrogen to freeze biological material in extremely cold temperatures. While they are known as -150 C freezers, they actually run closer to -200 C. When living cells are stored at such low temperatures, they go to sleep rather than die. Decades or even centuries later, the frozen cells can be safely thawed with no loss of life or degradation of DNA due to their long storage. 

Compared with other methods of cryo preserving materials, a liquid nitrogen freezer offers the most stable freezing environment using ultra-low temperatures. An electric freezer is incapable of maintaining temperatures below -135 C.  

Environmental researchers are interested in cryo preservation to preserve the last stock of endangered species. Rather than lose, say, the critically endangered black rhino species, the rhino's cells can be cryogenically frozen for the future. Coral reefs are also considered desirable candidates for cryo preservation due to their high rates of die-off from ocean acidity. 

Animal breeders are interested in cryo preservation to keep a desired bloodline alive, and fertility specialists see the potential for helping women delay childbirth through cryogenic preservation of fertilized embryos or eggs. 

The cryo preservation industry is not without its challenges. To ensure the viability of the frozen material, the cells must be slowly brought to the -150 C temperature and thawed in the same manner. If the temperature drops too quickly per minute, the cell membrane could rupture, causing cell death. 

Any time liquid nitrogen is used, there is a risk of oxygen displacement should the nitrogen storage tank leak or spill. Nitrogen gas has no color or odor, so employees would not notice that a leak had occurred. 

As nitrogen leaks into the atmosphere, it displaces oxygen. Levels can fall so low that the ambient air will not have enough oxygen for safe respiration. In an oxygen deficient environment, workers can experience respiratory distress, cognitive deficiencies, and death via asphyxiation simply by taking a few breaths in an oxygen deficient environment. 

Any facility that relies on nitrogen freezers to preserve biological material must take safeguards to detect and mitigate nitrogen leaks. One simple, effective solution is an oxygen monitor, such as that offered by PureAire.

How PureAire Can Help 

An oxygen monitor measures the levels of oxygen in the room. As long as there is enough oxygen, the monitor remains silent yet alert. If a spill occurs and levels fall close to the OSHA threshold, the alarm flashes a light and sounds an alarm to notify all personnel there is a leak. Employees can then leave the room before they are harmed by the oxygen deficient air. 

PureAire's oxygen monitor features a robust zirconium sensor, which can take accurate reading without maintenance for 10 or more years. The monitor provides steady readings when barometric pressure changes or thunderstorms occur. The O₂ monitor functions accurately in temperature extremes, and is suitable for use in cryogenic facilities and freezers.

If you're interested in a reliable oxygen monitor that's accurate, cost-effective, and fuss-free, you may want to partner with PureAire. Learn more at www.pureairemonitoring.com.

Nitrogen Tank or Cryogenic Dewar? Not Sure Where they are Installed? Here's the List!

Liquid nitrogen is used in a broad range of industries, from steelmaking and pharmaceutical to health care and ceramics. The inert gas is also used in laboratories, breweries, fine cooking, and more. Wherever liquid nitrogen is used, it must be stored securely so as not to mingle with air. Learn why nitrogen must be so carefully contained and where and how N₂ gas is stored. 

Bulk Nitrogen Tank Storage 

Liquid nitrogen is stored in a bulk nitrogen tank, also known as a nitrogen dewar. Nitrogen dewars exist wherever nitrogen is used, including in: 

• Labs
• Research universities 
• Restaurants, bars, and hotels 
• Freezers
• Hospitals 
• Flash freezing facilities
• Food processing facilities
• Cryotherapy facilities 
• Manufacturing plants 

The nitrogen dewar features a vacuum stopper, which protects the substance inside and prevents the nitrogen from boiling off. Dewars must have pressure release valves to prevent a bulk nitrogen tank explosion, which can occur when pressure builds up inside the tank. Since liquid nitrogen vaporizes at room temperature, it's critical that the tank stay sealed at all times.

Nitrogen and other insert gases, including argon, displace air when they are released into the environment. As oxygen is displaced, the air becomes oxygen deficient. Breathing oxygen deficient air causes respiratory distress and death via asphyxiation. Since nitrogen is colorless and odorless, there is no way to tell that a leak occurs unless you use an oxygen monitor, which samples oxygen levels. 

Given the risks posed by the material, bulk nitrogen tanks must be stored and transported safely and securely. Workers must bleed out pressure before transporting the tanks, for example, to reduce the risk of incident during transport. 

A robust ventilation system should be installed where the nitrogen is kept, so escaped nitrogen can be vented away, and fresh air should be circulated into the storage room several times per hour. 

Other safety measures include checking that fittings are appropriate, wearing gloves to prevent the nitrogen from burning the skin, and never filling dewars more than 80 percent full. 

While liquid nitrogen can be transferred from the bulk nitrogen tank into a smaller tank for small scale use, it must only be transferred into approved container. If you use the wrong container, it could shatter, leaking nitrogen into the air and decreasing available oxygen. 

Wherever nitrogen is stored or used, signs warning of the risks associated with the material should be posted as a warning to employees. When working with nitrogen, staff should wear eye protection, cryogenic gloves, and other safety equipment. 

Anyone who handles or works with the gas should be trained in safe use, storage, and handling of bulk nitrogen tanks as well. The valves, gauges, and other components of the nitrogen storage tank should be inspected regularly for safety, and replaced whenever you notice wear and tear. 

Why You Need an Oxygen Monitor Where Nitrogen is Stored

By placing an oxygen monitor wherever nitrogen is used, you can protect worker safety and prevent injury or fatality onsite. Oxygen monitors continually sample oxygen levels in the room, making sure that oxygen falls within acceptable levels. Should nitrogen gas leak from the dewar, ambient oxygen levels will start to tumble as the air is displaced by nitrogen. 

When oxygen levels fall to the threshold set by OSHA, which is 19.5 percent, the oxygen deficiency monitor will sound and flash alarms to notify workers onsite. Staff can exit the room before they begin to experience the adverse effects of being in an oxygen deficient atmosphere, then call 911 so emergency personnel can respond to the threat. 

PureAire offers a robust oxygen deficiency monitor capable of withstanding low temperatures of -40 Celsius. Once installed, the oxygen monitor works as intended for 10+ years with no annual maintenance or calibration. An ultra-loud alarm is audible throughout the premises, while a flashing light provides a secondary alert for employees. The unit easily mounts on the wall with brackets and comes with a 3-year warranty. Learn more about oxygen monitors from PureAire at www.pureairemonitoring.com. 

               

Oxygen Monitors now Required for Nitrogen, Argon, Helium, and CO2 use in Denver

Oxygen Monitors now Required for Nitrogen, Argon, Helium, and CO2 use in Denver

The Colorado city of Denver recently passed a new law that requires facilities that use insert gas to install oxygen deficiency monitors wherever these gases are used in excess of 100 pounds. Learn what the new law requires from businesses and how an oxygen sensor protects your employees, your business, and your peace of mind. 

What Denver's New Law Requires 

The law specifically applies to Colorado commercial, industrial, or manufacturing facilities that use inert gases, including nitrogen, argon, carbon dioxide, and helium. Facilities covered by the new law include water treatment plants, laboratories, and food processing plants. 

Fire suppression systems and medical gas systems are not covered by the Denver law. 

Under the new law: 

• Inert gas storage tanks must be placed in approved locations, whether stored inside or outside of the building 
• Storage containers must be secured to prevent tip-overs
• All valves and tubing used with the gas system must meet applicable standards
• Gases must vent outside the building
• All areas where gas is used must either have an oxygen deficiency monitor or continuous ventilation system, which keeps the oxygen levels in the room steady 
• Oxygen alarms should be visually inspected daily by trained staff members
•  Storage tanks, piping, and other parts of the system must be checked on a monthly basis 
• Tests of the system must be conducted regularly with either air or an inert gas

The Denver law sets out regulations for the type of oxygen deficiency monitor, plus where and how to use them. Acceptable monitors must be installed in any location where an inert gas leak could result in an oxygen deficient environment where public health could be at stake. 

Oxygen detectors must be on an approved device list and directly connected to the electrical supply and fire alarm system for the site. The oxygen detectors must be permanently mounted to the wall at a height which is consistent with the given gas's vapor density, so they can work properly. The devices must be located within their specified ranges of operation, in order to ensure the monitors can work as intended. 

The law prohibits self-zeroing or auto calibrating devices, unless they can be spanned or zeroed to check that the oxygen monitor is working as it should be. All installed oxygen monitors must be calibrated regularly to ensure safe and reliable operation. 

Alongside mounted alarms, companies must place signage that notifies employees of the oxygen monitor and gives instructions for what to do in the event of an alarm. Typical instructions tell staff to leave the building and call 911 if the alarm is going off. 

Signs notifying employees of the risk for oxygen deficiency must be posted anywhere inert gas is stored or used.

To further protect employees, the Denver law mandates that gas be transported, filled, or moved only by qualified individuals who follow protocol. All equipment, including piping systems, must be inspected for competency and the organization must maintain records for a period of three years. 

Why an Oxygen Monitor is a Practical Suggestion 

Oxygen deficient environments occur when an inert gas, such as helium, nitrogen, or argon, escapes into the environment and begins to displace oxygen. Since these gases have no odor or color, there is no way that staff working in the room can tell something is leaking. As the oxygen levels fall, employees can experience confusion and respiratory distress, resulting in death by asphyxiation. 

An oxygen monitor tracks ambient levels of oxygen and sets off an alarm when oxygen levels fall below the safe threshold, thus protecting employee safety. Since employees can both hear and see the alarm, they will know there is a problem even if they are operating loud equipment that overrides the noise of the sensor. 

Oxygen monitors are simple solutions to pressing problems faced by organizations that rely on inert gases and want to mitigate their risk. 

PureAire's oxygen sensors are cost-efficient and high quality. They are designed with a zirconium sensor, which is capable of lasting for as long as 10 years. PureAire's oxygen sensor is accurate in diverse environments, from storage freezers to basements. The sensor functions between -40 and 55 C. While PureAire's oxygen monitors do not need to be calibrated, they are capable of calibration, thus eligible for use in Denver. 

PureAire's monitors need little maintenance to work reliably once they are installed using the included wall-mounting brackets, and they are not affected by changes in the barometric pressure, a known problem with other types of oxygen sensors. PureAire's products can be set to measure oxygen levels of either 18 percent or 19.5 percent (which is the OSHA action level), to comply with standards. 

To learn more about oxygen monitors from PureAire, and view specifications, go to www.pureairemonitoring.com.